Correct Fuel for a 2003 Lincoln Aviator

The 2003 Aviator’s 4.6 L DOHC V8 requires premium unleaded gasoline (91 AKI / 95 RON or higher). Using regular (87 AKI) reduces power, increases knock risk, and may void warranty coverage for engine damage. The fuel filler door and owner’s manual both state “Premium Fuel Only.”